Method of molding concrete articles



Nova 5, 1935 J. T. KIMBROUGH fi y METHOD OF MOLDING CONCRETE ARTICLES 2 Shets-Sheet 1 Filed March 27, 1934 J I: imzml h Nov 5, 1935. J K|MBROUGH 2,@2@,65

METHOD OF MOLDING CONCRETE ARTICLES Filed March 2'7, 1934 2 Sheets-Sheet 2 m 4 1 I I I I? Patented Nov. 5, 1935 UNITED STATES PATENT OFFICE- METHOD OF MOLDING-CONCRETE ARTICLES 1 Claim.

of the'ma'chine is limited and material frequently cannot be produced as rapidly as desired.

It is an object of the present invention to sim-' v plify-the formation of concrete articles and also reduce the cost of production by utilizing angle form units which can be readily assembled over an area of any desiredsize after which the concrete mixture can be poured into the forms produced by theunitsa'n'd the exposed surface of the concrete given any'desired finish prior to setting and drying; v

,It is' afurther object to employ a one-piece angle fo'rm which, when properly positioned relative to angle" forms previously set up will produce a complete mold, Thus every addition of a single angle'unit Will result in the formation of a complete mold.

A still further object is to provide angle units which can be provided with suitably shaped cores whereby molded articles of any desired configurations can be produced.

A still further object is to provide angle units which can be assembled in any quantity desired upon a supporting surface of sufficient area so that mass production in any desired quantity can be effected readily, thereby materially reducing the cost of the molded articles.

With the foregoing and other objects in view I which will appear as the description proceeds, the

Figure 2 is an' enlarged section on line 22,- Figure l.

FigureB'is an" enlarged section on line 33, Figure 1.

Figured is a perspective view' drone of the 5 angle units.

Figure 5 is"a"si'milar view of a modified form of angle unit.

Figure 6 is a perspective view of another modification.

Figure 7 is a perspective view of another form of unit.

In carrying out the method of forming molded articles from concrete mixtures it is essential that a smooth area of the required size be utilized and on this area is erected a barge board! form'- ingone side wall of the area and anotherbarge board {forming another side wall of said area. The height of these barge boards is equal to the height of thearticle to be molded. g

If it is desired to produce a concrete-building block having channels in opposed faces and in its ends so as to pe'rmit'circulation of air'between the blocks when erected'to form a wall, angle units such as shown in Figures 1 to 4 i1l01uSiVe'25 can be employed. Each main angle unit comprisesa side board 3 and an end board 4 fixed relative to each other andfor'ming a right angle. on the sides of the board 3 are provided longitudinally extending tapered cores 5 and 6. The core 5 extends into the angle formed by the boards 3 and 4 and up to the board 4 and a small core 1 is extended laterally on the end board 4 from the core 5, there being a space left between this small core I and the free vertical edge of the end board which is equal to the widthof the core 5. Another similar small core I is located on the other side of the end board 4 directly opposite the core 1.

Any desired number of these angle units can I be employed.

In assembling them with the barge boards I and 2 it is necessary to fit against the board I a series of half units each of which comprises a straight board 8 having a longitudinal core 9 on one side only, this core being similar to the cores 5 and 6. It is also necessary to provide the barge board 2, which constitutes a mold member, with regularly spaced small cores Ill similar to the cores 1.

After a half angle unit 8-9 has been placed against the barge board 2 and along the board I, an angle unit such as shown in Figure 4 is placed in position with its end board 4 lapping one end of the half unit a and bearing against the barge board I while the side board 3 of said the method described are sills, bricks, angle unit bears against the barge board 2 and is extended parallel with the board I. Thus the core 1 on end board 4 will be fitted snugly between the cores 9 and 5 while the core II] will also be fitted snugly between said cores 9 and 5. Thereafter additional angle units can be placed in a row in line with the first angle unit and each angle unit thus set up will cooperate with the angle unit previously positioned, to form a complete mold for shaping a block. After the completion of one row of molds by the assemblage of angle units as explained, said row being indicated at a, another row of angle units indicated at b can be set up against and in parallel relation to the units of row a. In this second row of units the cores 1 on the units of the first row will extend between the cores 9 and 5 and 6 and 5 as shown.

The row produced in the manner described can be of any length desired and any number of rows can be used. After the predetermined area has thus been covered with rows of angle units, the third and fourth sides of the group of units can be held together by barge boards (not shown) corresponding with the boards I and 2 so as to define a complete rectangle in which the units will be held securely,

Following the assemblage of the angle units as described the wet concrete mixture can be poured into the forms produced by the units and after being tamped, the top surface of the concrete can be smoothed off and properly finished. The molded articles are then left to set and dry after which the angle units can be withdrawn from between the molded blocks.

While the cores 1, i and I0 are designed to produce end channels in the molded product, they have the added function of spacing the angle units properly so that after the various units have been assembled as heretofore described they will not shift accidentally out of proper relative positions.

As before stated all types of concrete blocks can be produced by the method herein described and after the barge boards and the half units have been placed in position a complete mold will be produced by the addition of every single angle unit.

Among the articles which can be produced by blocks, etc. For example, and as shown in Figure 5, each angle unit can be formed with an elevated bottom board H and a drop board I2 so that when the units are assembled and the concrete poured into the form, the space between the drop board I2 and the next adjoining unit and the space above the bottom board II will be filled, thereby producing an angle block.

In Figure 6 the angle unit is formed with a bottom board I3 having a longitudinally extended core l4. This unit, if assembled with other angle units in the same manner as heretofore described can be employed for the production of sills.

Should it be desired to produce concrete bricks, a simple form of unit such as shown in Figure 7 can be used. This angle unit comprises a side board [5 having an end board IS, the outer angle formed by these boards being shaped to provide a seat or rabbet IT for the reception of the end of the side board of another angle unit. Thus the units, when assembled, will not shift relative to each other but will be held properly assembled at all times.

It will be apparent that by producing molded articles through the use of angle units as herein described the cost of production is greatly reduced not only because of a reduction in the amount of material used in the formation 01 the molds but also because of the speed with which large quantities of molded products can be made.

What is claimed is:

The herein described method of producing molded materials from concrete which includes the step of assembling rows of angle units each of which forms two sides of a mold and cooperates with the next adjoining units to complete a mold, one row of angle units providing a single row of molds open at one side, thereafter closing all of said open sides with a single mold member, then securing all of the parts against relative movement, subsequently filling the units with plastic material, thereby to produce separate molded articles, subsequently smoothing on the exposed surfaces of the molded articles to finish them, and finally separating the mold member and angle units to release the molded articles.

JOHN T. KIMBROUGH. 

